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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 4, 2012
Accepted April 23, 2013

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Removal of humic acid from water using adsorption coupled with electrochemical regeneration

Hafiz Muhammad Anwaar Asghar^† Syed Nadir Hussain Edward Pelham Lindfield Roberts¹ Nigel Willis Brown²

School of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, UK ¹Department of Chemical and Petroleum Engineeirng, University of Calgary, 2500 University Dr NW, Calgary, AB T2N 1N4, CA, Canada ²Arvia Technology Limited, Daresbury Innovation Centre, Keckwick Lane, Daresbury, Cheshire WA4 4FS, UK

Korean Journal of Chemical Engineering, July 2013, 30(7), 1415-1422(8), 10.1007/s11814-013-0066-z

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Abstract

A novel and economic waste water treatment technology comprised of adsorption coupled with electrochemical regeneration was introduced at the University of Manchester in 2006. An electrically conducting adsorbent material called NyexTM 1000 (Graphite intercalation based material) was developed for the said purpose. This adsorbent material delivered significantly lower adsorption capacity for the removal of a number of organic pollutants. With the aim to expand the scope of newly developed adsorbent material called NyexTM 2000, we studied the adsorption of humic acid followed by electrochemical regeneration. NyexTM 2000 is a highly electrically conducting material with an adsorption capacity almost twice that of NyexTM 1000 (intercalation based graphite compound) for humic acid. The adsorption of humic acid onto both NyexTM adsorbents was found to be fast enough keeping almost the same kinetics with approximately 50% of the adsorption capacity being achieved within the first twenty minutes. The parameters affecting the regeneration efficiency, including the treatment time, charge passed and current density, were investigated. The regeneration efficiency at around 100% for NyexTM 1000 & 2000 adsorbents saturated with humic acid was obtained using the charge passed of 8 and 22 Cg^(-1) at a current density of 7mA cm^(-2) during a treatment time of 30minutes, respectively.

Keywords

Humic Substances NyexTM Materials Adsorption Electrochemical Regeneration Electrical Conductivity

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